SS24T3H Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS24T3H is a Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 2 A average rectified current in a Surface Mount SMB (DO-214AA) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part exhibits fast recovery characteristics with switching speed ≤ 500 ns at currents > 200 mA, suitable for high-frequency rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	ns
Current - Reverse Leakage @ Vr	400	µA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS24T3H is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 2 A minimum
Mounting Type: Surface Mount
Package / Case: DO-214AA (SMB)
Technology: Schottky
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Substitution Categories:

Direct Equivalents maintain identical electrical specifications and package form factor. These parts are pin-compatible and electrically interchangeable without circuit modification.

Higher Current Rated Substitutes exceed the 2 A current specification while maintaining the 40 V reverse voltage rating and SMB package. These parts are suitable for applications where additional current margin is required, provided the forward voltage drop and reverse leakage characteristics remain acceptable for the circuit design.

Alternative Manufacturer Equivalents provide the same electrical performance from different manufacturers, offering procurement flexibility and supply chain alternatives.

Parameter Comparison

Parameter	SS24T3H (Main)	SS24T3G	SK54B-LTP	SS24-E3/52T
Manufacturer	onsemi	onsemi	Micro Commercial Co	Vishay General Semiconductor - Diodes Division
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	2 A	2 A	5 A	2 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	500 mV @ 2 A	550 mV @ 5 A	500 mV @ 2 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	400 µA @ 40 V	400 µA @ 40 V	1 mA @ 40 V	400 µA @ 40 V
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-65 to 125 °C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	Vendor Undefined	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SS24T3G (onsemi) is the primary direct equivalent substitute. This part maintains identical electrical specifications to the SS24T3H across all critical parameters: 40 V reverse voltage, 2 A average rectified current, 500 mV forward voltage drop at 2 A, and fast recovery switching characteristics. The SS24T3G is classified as Active product status, ensuring long-term availability and supply continuity. Moisture sensitivity is rated MSL 1 (Unlimited), providing superior handling characteristics compared to the obsolete SS24T3H. This part is supplied in Cut Tape (CT) and Digi-Reel® packaging formats.

SS24-E3/52T (Vishay General Semiconductor - Diodes Division) provides direct electrical equivalence with identical 40 V reverse voltage and 2 A current ratings, matching forward voltage and reverse leakage specifications. This part is Active status and ROHS3 compliant. Operating temperature range is -65 to 125 °C, which is narrower than the SS24T3H but suitable for most industrial applications. This part is supplied in Cut Tape (CT) packaging.

SK54B-LTP (Micro Commercial Co) is a higher current rated alternative rated for 5 A average rectified current while maintaining the 40 V reverse voltage rating and SMB package form factor. Forward voltage at rated current is 550 mV at 5 A. Reverse leakage is 1 mA at 40 V, which is higher than the SS24T3H specification. This part is suitable for applications requiring additional current margin or where the higher reverse leakage is acceptable. The SK54B-LTP is Active status and ROHS3 compliant.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements equivalent to the original SS24T3H.

Frequently Asked Questions (FAQ)

Q: Can SS24T3G be used as a direct replacement for SS24T3H?

A: Yes. The SS24T3G maintains identical electrical specifications: 40 V reverse voltage, 2 A average rectified current, 500 mV forward voltage drop at 2 A, and fast recovery switching characteristics. Both parts use the DO-214AA (SMB) package with identical pinout. The SS24T3G is Active status, providing superior supply continuity compared to the obsolete SS24T3H.

Q: What is the difference between SS24T3H and SK54B-LTP?

A: The primary difference is current rating. The SK54B-LTP is rated for 5 A average rectified current compared to 2 A for the SS24T3H, while both maintain 40 V reverse voltage and SMB package compatibility. The SK54B-LTP exhibits higher reverse leakage (1 mA at 40 V versus 400 µA at 40 V) and slightly higher forward voltage drop (550 mV at 5 A versus 500 mV at 2 A). The SK54B-LTP is suitable for applications requiring higher current capacity.

Q: Are all substitute parts pin-compatible with SS24T3H?

A: Yes. All listed substitute parts use the DO-214AA (SMB) package with identical pinout and mounting footprint. No PCB layout modifications are required for substitution.

Q: What is the operating temperature range for each substitute?

A: SS24T3H and SS24T3G: -55 to 150 °C. SK54B-LTP: -55 to 150 °C. SS24-E3/52T: -65 to 125 °C. The SS24-E3/52T has a narrower upper temperature limit but extends the lower limit to -65 °C.

Q: Do all substitute parts meet RoHS compliance?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.

Q: What packaging formats are available for substitute parts?

A: SS24T3G is supplied in Cut Tape (CT) and Digi-Reel® formats. SS24-E3/52T is supplied in Cut Tape (CT) format. SK54B-LTP is supplied in Cut Tape (CT) and Digi-Reel® formats.

Q: Can SK54B-LTP be used in a circuit designed for 2 A operation?

A: Yes. The SK54B-LTP is rated for 5 A, which exceeds the 2 A requirement. The part operates safely at lower current levels. However, the higher reverse leakage (1 mA versus 400 µA) and slightly higher forward voltage drop (550 mV at 5 A versus 500 mV at 2 A) should be evaluated for circuit performance impact.

Q: What is the moisture sensitivity level (MSL) for each part?

A: SS24T3H: Vendor Undefined. SS24T3G: MSL 1 (Unlimited). SK54B-LTP: MSL 1 (Unlimited). SS24-E3/52T: MSL 1 (Unlimited). MSL 1 (Unlimited) indicates superior moisture resistance and handling flexibility.

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